SI9110206B - Process for the bleaching of cellulose for artificial fibres without chlorine - Google Patents

Process for the bleaching of cellulose for artificial fibres without chlorine Download PDF

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Publication number
SI9110206B
SI9110206B SI9110206A SI9110206A SI9110206B SI 9110206 B SI9110206 B SI 9110206B SI 9110206 A SI9110206 A SI 9110206A SI 9110206 A SI9110206 A SI 9110206A SI 9110206 B SI9110206 B SI 9110206B
Authority
SI
Slovenia
Prior art keywords
stage
eop
bleaching
cellulose
temperature
Prior art date
Application number
SI9110206A
Other languages
Slovenian (sl)
Other versions
SI9110206A (en
Inventor
Anton Hruschka
Walter Peter
Oskar Hoeglinger
Original Assignee
Lenzing Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lenzing Aktiengesellschaft filed Critical Lenzing Aktiengesellschaft
Publication of SI9110206A publication Critical patent/SI9110206A/en
Publication of SI9110206B publication Critical patent/SI9110206B/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Landscapes

  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Artificial Filaments (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Detergent Compositions (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Processing Of Solid Wastes (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The process comprises three stages, namely an oxygen bleach which is optionally combined with a hydrogen peroxide bleach (EOP stage), an ozone bleach (Z stage) and a peroxide bleach (P stage). According to the invention, the residual oxygen content of the exit air from the Z stage is completely reacted in the EOP stage, and the effluent of the Z stage is used for dilution between the EOP and Z stages and/or for ash removal from the pulp after bleaching. It is advantageous in this case to control the temperature, the NaOH supply and the O2/H2O2 ratio in the EOP stage, so that the oxygen consumption at a constant conversion is adjusted to the residual oxygen content of the exit air from the Z stage.

Claims (7)

1 Patentni zahtevki 1. Postopek za beljenje, brez klora, celuloze za pripravo umetnih vlaken, z ozonom po tristopenjskem postopku, ki sestoji iz beljenja s kisikom, beljenja z ozonom (Z-stopnja) in beljenja s peroksidom (P-stopnja), pri čemer odpadni zrak Z-stopnje dovajamo k beljenju s kisikom, označen s tem, da je beljenje s kisikom kombinirano z beljenjem z vodikovim peroksidom (EOP-stopnja), da preostalo vsebnost kisika iz odpadnega zraka Z-stopnje v EOP-stopnji popolnoma privedemo do reakcije in da uporabimo odpadno vodo Z-stopnje, katere pH vrednost prednostno leži pod 3, za razredčenje med EOP in Z-stopnjo in/ali za odstranitev pepela iz celuloze po beljenju.1. A method of bleaching, without chlorine, cellulose for the preparation of artificial fibers, with ozone according to a three-stage process consisting of oxygen bleaching, ozone bleaching (Z-step) and bleaching with peroxide (P-step), in characterized in that the oxygen bleaching is combined with hydrogen peroxide bleaching (EOP step) so that the residual oxygen content of the waste air of the Z-step in the EOP stage is completely brought to reacting and using a waste water of the Z-step, the pH value of which preferably lies below 3 for dilution between the EOP and the Z-step and / or for the removal of the ash from the cellulose after bleaching. 2. Postopek po zahtevku 1, označen s tem, da uravnavamo temperaturo, dodatek NaOH in razmerje O2/H2O2 v EOP-stopnji tako, da je poraba kislika pri konstantni pretvorbi naravnana na vsebnost preostalega kisika v odpadnem zraku Z-stopnje.Method according to claim 1, characterized in that the temperature, the addition of NaOH and the O2 / H2O2 ratio in the EOP stage are adjusted, such that the consumption of the acid in the constant conversion is adjusted to the residual oxygen content in the waste air of the Z-step. 3. Postopek po zahtevku 2, označen s tem, da znaša temperatura EOP-stopnje 70-100°C, prednostno 75°C.A process according to claim 2, characterized in that the temperature of the EOP step is 70-100 ° C, preferably 75 ° C. 4. Postopek po zahtevku 2 ali 3, označen s tem, da je koncentracija NaOH v EOP-stopnji med 2,5-5 mas.% glede na celulozo, beljeno absolutno suho.A process according to claim 2 or 3, characterized in that the concentration of NaOH in the EOP stage is between 2.5 and 5% by weight based on cellulose bleached absolutely dry. 5. Postopek po enem od zahtevkov 1 do 4, označen s tem, daje v zmesi 02-H202 v EOP-stopnji prisotno največ toliko H202, kot je 02 glede na maso.Method according to one of Claims 1 to 4, characterized in that in the mixture of 02-H2O2 in the EOP step is present not more than H202, such as 02, by weight. 6. Postopek po enem od zahtevkov 1 do 5, označen s tem, da poteka Z-stopnja z zmesjo 02/03 z maksimalno 10 mas.% 03. 2Method according to one of claims 1 to 5, characterized in that the Z-step is carried out with a mixture of 02/03 with a maximum of 10% by weight 03. 2 7. Postopek po enem od zahtevkov 1 do 6, označen s tem, da znaša temperatura Z-stopnje 40-70°C, prednostno 50-60°C.Method according to one of claims 1 to 6, characterized in that the temperature of the Z-step is 40-70 ° C, preferably 50-60 ° C.
SI9110206A 1990-02-07 1991-02-06 Process for the bleaching of cellulose for artificial fibres without chlorine SI9110206B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0026190A AT395028B (en) 1990-02-07 1990-02-07 METHOD FOR CHLORINE-FREE BLEACHING OF FIBER FIBER
YU20691A YU47388B (en) 1990-02-07 1991-02-06 CELLULOSE BLEACHING PROCEDURE FOR CHLORINE-FREE FIBER

Publications (2)

Publication Number Publication Date
SI9110206A SI9110206A (en) 1998-02-28
SI9110206B true SI9110206B (en) 2000-04-30

Family

ID=3485841

Family Applications (1)

Application Number Title Priority Date Filing Date
SI9110206A SI9110206B (en) 1990-02-07 1991-02-06 Process for the bleaching of cellulose for artificial fibres without chlorine

Country Status (22)

Country Link
US (1) US5145557A (en)
EP (1) EP0441113B1 (en)
JP (1) JPH04300380A (en)
AT (2) AT395028B (en)
BR (1) BR9100516A (en)
CA (1) CA2035698C (en)
CZ (1) CZ280077B6 (en)
DE (1) DE59007341D1 (en)
DK (1) DK0441113T3 (en)
ES (1) ES2061008T3 (en)
FI (1) FI98077C (en)
HR (1) HRP930456A2 (en)
IN (1) IN174833B (en)
LT (1) LT3392B (en)
LV (1) LV10514B (en)
NO (1) NO178079C (en)
PL (1) PL169421B1 (en)
RU (1) RU2040616C1 (en)
SI (1) SI9110206B (en)
SK (1) SK278326B6 (en)
YU (1) YU47388B (en)
ZA (1) ZA91840B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2053035C (en) * 1990-10-12 1997-09-30 Repap Enterprises Inc. Chlorine-free wood pulps and process of making
US5211809A (en) * 1991-05-21 1993-05-18 Air Products And Chemicals, Inc,. Dye removal in oxygen color stripping of secondary fibers
BE1006056A3 (en) * 1992-07-06 1994-05-03 Solvay Interox Method of laundering of chemical pulp.
SE500113C2 (en) * 1992-07-09 1994-04-18 Kamyr Ab Method of bleaching pulp for disposal of released metals
US5374333A (en) * 1992-07-30 1994-12-20 Kamyr, Inc. Method for minimizing pulp mill effluents
FR2695947B1 (en) * 1992-09-18 1994-10-21 Saint Gobain Papier Bois Gie C Process for bleaching chemical cellulosic pastes.
DE69316988T2 (en) * 1992-10-23 1998-07-30 Mac Millan Bloedel Ltd IMPROVED Ozone Bleaching
SE500335C2 (en) * 1992-10-26 1994-06-06 Sca Wifsta Oestrand Ab Bleaching of sulfate pulp with peroxide-ozone-peroxide
US6210527B1 (en) 1994-03-14 2001-04-03 The Boc Group, Inc. Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream
SE504424C2 (en) * 1994-11-04 1997-02-10 Kvaerner Pulping Tech Ways to precipitate transition metals and alkaline earth metals from bleaching liquids by adding alkaline liquid
SE516030C2 (en) * 1994-11-14 2001-11-12 Aga Ab Regeneration of a gas mixture from an ozone bleaching stage
US5656130A (en) * 1995-04-28 1997-08-12 Union Camp Holding, Inc. Ambient temperature pulp bleaching with peroxyacid salts
CA2239855C (en) * 1995-12-07 2002-07-02 Beloit Technologies, Inc. Oxygen delignification of medium consistency pulp slurry
AT402827B (en) * 1995-12-22 1997-09-25 Chemiefaser Lenzing Ag CELLULOSE MOLDED BODY AND METHOD FOR THE PRODUCTION THEREOF
EP1728918A3 (en) * 2005-05-12 2006-12-13 Voith Patent GmbH Proces for removing impurities from an aqueous fibrous suspension
US9339058B2 (en) 2012-04-19 2016-05-17 R. J. Reynolds Tobacco Company Method for producing microcrystalline cellulose from tobacco and related tobacco product
SE538064C2 (en) * 2014-06-17 2016-02-23 Valmet Oy Method of producing dissolving pulp from lignocellulosic materials
FI127444B (en) 2015-05-27 2018-06-15 Kemira Oyj Method for reducing pulp viscosity in production of dissolving pulp

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196043A (en) * 1970-12-21 1980-04-01 Scott Paper Company Kraft pulp bleaching and recovery process
CA966604A (en) * 1970-12-21 1975-04-29 Scott Paper Company Kraft pulp bleaching and recovery process
JPS5430902A (en) 1977-06-27 1979-03-07 Seisan Kaihatsu Kagaku Kenkyus Industrial multistage pulp bleaching method
US4216054A (en) * 1977-09-26 1980-08-05 Weyerhaeuser Company Low-consistency ozone delignification
US4372812A (en) * 1978-04-07 1983-02-08 International Paper Company Chlorine free process for bleaching lignocellulosic pulp
US4283251A (en) * 1980-01-24 1981-08-11 Scott Paper Company Ozone effluent bleaching
US4619733A (en) * 1983-11-30 1986-10-28 Kooi Boon Lam Pollution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor
AT384837B (en) * 1985-06-27 1988-01-11 Steyrermuehl Papier Process and arrangement for the delignification of pulp with oxygen

Also Published As

Publication number Publication date
ES2061008T3 (en) 1994-12-01
CA2035698C (en) 2003-03-25
LT3392B (en) 1995-08-25
NO910455D0 (en) 1991-02-06
ATA26190A (en) 1992-01-15
JPH04300380A (en) 1992-10-23
FI910601A (en) 1991-08-08
IN174833B (en) 1995-03-18
YU47388B (en) 1995-01-31
FI98077C (en) 1997-04-10
HRP930456A2 (en) 1995-12-31
NO178079C (en) 1996-01-17
US5145557A (en) 1992-09-08
LV10514B (en) 1995-10-20
YU20691A (en) 1994-05-10
PL288978A1 (en) 1992-01-13
SI9110206A (en) 1998-02-28
DK0441113T3 (en) 1994-10-24
FI910601A0 (en) 1991-02-07
FI98077B (en) 1996-12-31
CA2035698A1 (en) 1991-08-08
CS9100280A2 (en) 1991-09-15
BR9100516A (en) 1991-10-29
LV10514A (en) 1995-02-20
DE59007341D1 (en) 1994-11-03
AT395028B (en) 1992-08-25
ZA91840B (en) 1992-01-29
NO178079B (en) 1995-10-09
LTIP753A (en) 1995-01-31
EP0441113B1 (en) 1994-09-28
CZ280077B6 (en) 1995-10-18
ATE112338T1 (en) 1994-10-15
NO910455L (en) 1991-08-08
PL169421B1 (en) 1996-07-31
RU2040616C1 (en) 1995-07-25
SK278326B6 (en) 1996-11-06
EP0441113A1 (en) 1991-08-14

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